09-16-2014 12:16 AM - edited 03-17-2019 12:10 AM
Hello,
We are running Cisco Call Manager with MGCP and E1 connection to a Siemens PSTN
We have started experiencing no voice when calling to Siemens or calling from Siemens to Cisco. The call goes through but there is no ring tone and no voice when the call is answered.
Also, I noticed that MGCP fails back to our Sub sometime, but I am not sure if these issues are somehow related
How can I troubleshoot voice problems with E1?
Thank you
09-16-2014 01:23 AM
Hi fgasimzade,
Can you check with Siemen what channel order do they follow.
Cisco VG follows descending order for outbound calls and expect ascending for incoming calls.
You can toggle config using below commands
interface SerialX/Y/Z:15
isdn bchan-number-order {ascending | descending}.
HTH,
Regards,
Mohammed Noor
09-16-2014 02:19 AM
Thank you Mohammed
Can the channel order be the reason if voice problems happens from time to time, not always?
09-16-2014 02:26 AM
That's Right
09-16-2014 02:29 AM
Ok, but I think that since we are running MGCP, I would need to do this on the Call Manager side, at the gateway configuration page, right?
09-16-2014 02:35 AM
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